CN103586546B - A kind of method and apparatus utilizing cydariform worm screw tool processes internal gear tooth - Google Patents
A kind of method and apparatus utilizing cydariform worm screw tool processes internal gear tooth Download PDFInfo
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- CN103586546B CN103586546B CN201310540777.2A CN201310540777A CN103586546B CN 103586546 B CN103586546 B CN 103586546B CN 201310540777 A CN201310540777 A CN 201310540777A CN 103586546 B CN103586546 B CN 103586546B
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Abstract
A kind of device utilizing cydariform worm screw tool processes internal gear tooth, this device forms bed piece by machine pillar (1), lathe base (0), bed piece is connected with vertical feed moving cell (2), worm screw tool drives unit head (3), workpiece rotary motion unit (4), workpiece level feed motion unit (5), worm screw instrument folding unit (6) and unit head oscillating motion unit (7); Utilize a method for cydariform worm screw tool processes internal gear tooth, the method has four large steps.The present invention cydariform worm screw instrument is divided into two parts and before processing after in good time folding, major diameter tool processes minor diameter internal gear surface can be utilized and realize the Continuous maching of internal gear, greatly improving working (machining) efficiency; The radius of gyration increasing cydariform worm screw instrument can reduce the impact of worm screw rotation error on machining accuracy, and therefore the method also may be used for the processing of precise inner gear.
Description
Technical field
The present invention relates to a kind of method and apparatus utilizing cydariform worm screw tool processes internal gear tooth, belong to machine driving and Machining Technology field.
Background technology
Internal gear is the important actuated element forming planetary reduction gear, harmonic speed reducer, and the general Gear Shaping method that adopts is processed at present, and its working (machining) efficiency is low, machining accuracy is not easy to improve, and cannot meet the requirement that high-performance decelerator manufactures.Adopt super hard abrasive formed grinding wheel and utilize forming process grinding internal gear to be the major processes realizing Hardened gear face interior bracing at present, but this method is subject to the restriction of the various factors such as tool sizes and rigidity, emery wheel precision and cost, is not also difficult to be used widely.The processing method of corresponding with this situation is external gear obtains significant progress, its roughing adopts gear hobbing, fine finishining can adopt worm abrasion wheel continuous grinding, therefore has the features such as working (machining) efficiency is high, precision is high, efficiency is high, cost is low, to succeed application in industrial quarters.Current employing worm wheel grinding can obtain several tens of seconds and process a miniature gear, adopt common low cost emery wheel, can continuous dressing and can continuous grinding be that this processing mode obtains successful key.But be subject to the restriction of transmission principle, Worm Wheel System can only be external toothing transmission, does not up to the present also have the meshing relation of Study on Meshing Theory worm screw and internal gear, because be almost impossible or do not have effective from the engagement of internal gear and worm screw instinctively.In fact, this is huge mistaken ideas.From the theory of engagement itself, when the flank of tooth of worm screw is enough in short-term and when taking suitable supporting way, worm screw can be placed in the inside of internal gear completely and produce gear motion with it, the nodal section of certain worm screw is not now generally the face of cylinder, but a cydariform face, the generatrix radius of cydariform can have multiple different size, but usually should be less than the pitch radius of processed gear, but the tactical diameter of cydariform can be larger than the diameter of internal gear, therefore adopt worm screw internal messing namely can process gear wheel and also can process pinion.Wherein, when worm screw tactical diameter is greater than gear diameter, only have a kind of possibility, instrument worm screw is manufactured hollow-core construction by exactly, and the hollow instrument of ring-type and gear ring are penetrated mutually, so just can realize continuous print gear motion.Utilize worm instrument Continuous maching internal gear significantly to cut down finished cost, and all multiple tooth structure of circumference of the minimum various internal gear of diameter or similar gear can be processed.A kind of novel kind of drive can be provided significantly can to reduce the size of external toothing worm gearing simultaneously.
Summary of the invention
The invention provides a kind of method and apparatus utilizing cydariform worm screw tool processes internal gear tooth, it is a kind of novel worm gearing and utilizes this mechanism to realize the method and apparatus of internal gear high-efficiency high-accuracy processing.
(1) main method of the present invention is a kind of cydariform worm screw instrument of design, for machining interal expeditiously.For large-scale internal gear, cydariform worm screw instrument can be placed in gear internal, and namely the maximum appearance and size of its instrument is less than gear.For small ring gear, cydariform worm screw tool sizes can much larger than internal gear workpiece size, now worm screw is hollow annular flat structure, can be divided into two parts and integrally participate in processing through coupling together after workpiece in process or make the two keep stable relative position relation in process by shell structure.Fig. 1 a, 1b, 1c are a kind of front view, left view and top view of utilizing minor diameter cydariform worm screw worm screw to process the principle assumption diagram of major diameter internal gear respectively. set the generatrix radius of cydariform worm screw worm screw as R0, the maximum revolution outer radius of pitch circle of cydariform worm screw worm screw is R2, and the radius of processed internal gear is R1.In order to machining interal, cydariform worm screw must tilt certain angle G, guarantees that the profile of tooth direction of cydariform worm screw is consistent with processed tooth-formation of gear direction.Certainly, when cydariform worm screw adopts different helical angles, axis angle therebetween can increase or reduce the helical angle of a processed internal helical gear.Therefore, when processing oblique internal gear, the reasonable hand of helix of cydariform worm screw is selected can to ensure that tool axis becomes 90 degree with internal gear axis under specific circumstances.In Fig. 1 c, workpiece 01 and cydariform worm screw instrument 02 form engagement on the left of this figure, and the axis of this cydariform worm screw can according to shown in Fig. 1 b and have the angle G determined between the axis of processed gear.This can guarantee that the tangent line on the pitch circle of cydariform worm screw with gears meshing place has identical direction.Fig. 2 a, 2b, 2c are a kind of front view, left view and top view of utilizing major diameter cydariform worm screw to process the principle assumption diagram of minor diameter internal gear respectively.Now, consider that tool diameter is large, diameter of work is little, cutter cannot enter among workpiece completely, and the radius of gyration R2 of instrument is greater than the diameter R1 of workpiece to be machined, and therefore tool base needs to manufacture hollow annular.In order to ensure that the pitch circle of cydariform worm screw and internal gear has common tangential direction at point of contact place, cydariform worm screw needs according to installing shown in Fig. 2 b and making the angle between the axis of cydariform worm screw instrument and the axis of workpiece gear be G.G is the helical angle at cydariform worm screw instrument pitch circle maximum gauge place.According to Fig. 1 c or Fig. 2 c, workpiece 01 only do around himself axis at the uniform velocity gyration and in a horizontal plane radial feed motion, cydariform worm screw instrument 02,02 ' then around own axes rotate while do at the uniform velocity along axis of workpiece direction axial feed motion.Utilize these 4 basic exercises can complete continuous gear hobbing or the grinding of internal tooth spur gear, these 4 motions simultaneously can be undertaken combining for processing helical teeth internal gear by rational method.But the motion of adjustment angle G also can as the free degree of a participation lathe ganged movement, for forming five-axis linkage machine tools with other four axle, may be used for the internal gear that gear modification or processing have unconventional flank profil.In figure 1 c, instrument can be made to run through and mistake from workpiece by designing suitable worm spiral angle, a kind of more interesting internal messing worm-drive mode can be formed like this.Ring-type instrument in Fig. 2 c according to circumstances can manufacture various structures form (mode 1), not needing screw to connect but can keep the mode (mode 2) of stable and correct relative position relation under bearing and housing effect as two halves full symmetric, resolve into vary in size by the acting in conjunction of screw pin through the mode or opening that directly reservation one is little that connect into parts after instrument, it is being allowed that workpiece enters the mode (mode 3) of its inside.Wherein mode 3 is applicable to rough machined situation.This ring-type instrument is also extremely important at the supporting way of lathe, a kind of is adopt upper and lower two parts to split two parts up and down that the rolling of mode or sliding bearing support ring-type instrument respectively, the program is applicable to mode 1, more than 3 groups roller bearings can be adopted to connect into two parts of overall instrument, and the method is applicable to mode 2.Mode 3 is applicable to adopting sliding bearing to support.The revolution of worm screw instrument can adopt the gear mechanism or the realization of small―gap suture gear mechanism transmission of eliminating gap.
In sum, a kind of method utilizing cydariform worm screw tool processes internal gear tooth of the present invention, the method concrete steps are as follows: step one: design a kind of pancake or the very short cydariform worm screw instrument of length, as shown in the part 02 in Fig. 1 c or shown in 02 ' in Fig. 2 c.This worm abrasion wheel can be made single head or multistart worm, and worm screw is positioned on an anchor ring, and the generating circle radius of anchor ring is the pitch radius R0 of imaginary gear C1, C2 in Fig. 1 c or Fig. 2 c.In figure, the cross section figure of the gear teeth on C2 is transversal shape rotation half tooth elongation (when worm screw is single start worm) on C1 or the shape after multiple half angular pitch identical with number of threads, its intermediate shape is that this imaginary gear cuts shape simultaneously according to the anchor ring screw formation done after the continuous rotation of above-mentioned rule in the process rotated around tool axis, and the shape of abscissusing of imaginary gear self can be tried to achieve according to envelope principle.
Step 2: design and a kind ofly drive cydariform worm screw instrument continuously according to the worm screw tool drives unit head of given speed and displacement movement.Current lathe is many directly manufactures multi-shaft interlocked lathe, adopts cydariform worm screw tool processes internal gear, and what first will solve is transmission and the support problem of cydariform worm screw instrument.When processing major diameter internal gear, worm screw can be made into flat structure and be placed in the inside of processed gear, and the motion of worm screw can adopt conventional angle milling or drill unit support and carry out transmission by precision gear chain.Now cydariform worm screw instrument by its endoporus and end face and two groups of bearing freely-supporteds on the support separating from its both ends of the surface, one end of cydariform worm screw instrument is parallel with an external gear, this external gear by the gears meshing on output shaft in the very little group of meshed gears successively of the diameter of a string axis being parallel and the enough servomotors at a distance of pedestal upper end, thus can realize the Direct driver of servomotor to cydariform worm screw instrument.Because which is fairly simple and conventional, therefore the present invention does not provide concrete structural drawings explanation.
What the present invention introduced is when processing the very little internal gear of diameter and when needing to improve Gear Processing precision, adopts the machine tool structure of large-diameter hollow worm screw tool processes internal gear.Fig. 4 a, 4b, 4c are a kind of front view, left view and top view of utilizing the worm screw tool drives unit head of large scale hollow squeeze worm screw tool processes minor diameter internal gear respectively.Fig. 4 a, 4b, in 4c, worm screw upper tool part 306 is by left, right bearing 319, 320 are supported in by part 305, 307, 315, in the unit head upper body of 317 compositions, worm screw tool lower portion 303 is by left, right bearing 319, the bottom rolling element of 320 is supported in by part 301, 302, 325, in the unit head lower case of 326 compositions, upper and lower two parts determine the relative position relation of its connection status by a pair alignment pin 311, unit head top and the bottom separately housing by linking together in housing attachment screw 328, left, right guide plate 324, 328 are connected on the work top of worm screw instrument folding unit 6 by slide plate screw 323, the movement position and track determined can be had during for controlling the folding of unit head bottom.Worm screw tool servo motor 314 drives the internal gear of worm screw instrument to make it do the controlled rotary motion of continuous print position and speed by cog belt transmission system 313,334,333,332,331 and gear train assembly 330,329,321,322.
Step 3: design a kind of workpiece rotary motion unit 4 driving processed internal gear to do position and speed controlled motion.It is a kind of principle assumption diagram of workpiece rotary motion unit as shown in Fig. 5 a, 5b.In the confined space that housing base 401 and housing cover 402 are formed, a pair driving gear 406 and tray for work pieces gear 408 are installed, wherein driving gear 406 is installed on the end of servomotor 407, tray for work pieces gear 408 is supported on bearing 403, the inside of tray for work pieces gear 408 is just in time identical with the overall diameter of processed gear or identical with the external diameter for workpiece gear being arranged on the fixture in tray for work pieces gear 408, and workpiece to be machined gear 404 can be fixed on tray for work pieces gear 408 by work clamp group 405 and to guarantee the stability of this position.
Step 4: design a kind of interior bracing lathe with 5 frees degree, as shown in Fig. 3 a, 3b.The parts such as a vertical feed moving cell 2, worm screw tool drives unit head 3, workpiece rotary motion unit 4, workpiece level feed motion unit 5, worm screw instrument folding unit 6, unit head oscillating motion unit 7 are comprised with one for the lathe base 0 and the machine pillar 1 that support be connected above each several part in figure.Wherein worm screw tool drives unit head 3 rotates according to the given characteristics of motion for driving worm screw, workpiece rotary motion unit 4 rotates according to the given characteristics of motion for driving workpiece gear, unit head oscillating motion unit 7 is for the angle G between control tool and workpiece, vertical feed moving cell 2 for the feed motion that makes worm screw instrument rotate to do axis direction when processing internal spur gear while process whole profiles of tooth in facewidth direction, workpiece level feed motion unit 5 is with realizing radial feed with the machining accuracy of control gear short transverse.Above-mentioned 5 motions suitably can be adjusted by programme-control, and therefore the method may be used for processing internal spur gear, helical teeth internal gear, mending teeth of gear processing etc.Its main points are that unit head folding unit 6 may be used for controlling the in good time folding of two parts up and down of worm screw tool drives unit head 3, namely when mounting and dismounting workpiece, worm screw instrument keeps separated position, as shown in Figure 6 a, when machining gears, worm screw instrument can keep the closure state shown in Fig. 6 b.
Adopt said method, in principle can the interior involute gear of processed complex, also can by other periodically inner curve curved-surface structure of appropriate design worm screw tool processes, as the negative camber etc. of gear pump and motor etc.The kind of drive adopted also can adopt frictional drive or Steel Belt Transmission etc. except employing gear drive, cog belt transmission, can eliminate drive gap further like this, improves Gear Processing precision.
(2) the present invention includes a kind of device utilizing cydariform worm screw tool processes internal gear tooth, see Fig. 3, it is the device with the worm screw tool processes minor diameter internal gear of cydariform pitch circle bus of a kind of utilization based on anchor ring, this device forms bed piece by machine pillar 1, lathe base 0, bed piece is connected with vertical feed moving cell 2, worm screw tool drives unit head 3, workpiece rotary motion unit 4, workpiece level feed motion unit 5, worm screw instrument folding unit 6 and unit head oscillating motion unit 7.
This machine pillar 1, lathe base 0 are the box hardwares adopting casting or welding procedure to make;
This vertical feed moving cell 2 is by vertical feed servomotor 21, vertical feed shaft coupling 22, vertical feed front-end bearing pedestal assembly 23, vertical feed nut 24, vertical feed nut seat 25, vertical feed screw 26, vertical feed rear bearing block assembly 27, line slideway 28, vertical feed workbench 29 forms, between it, relation is: vertical feed screw 26 is supported in vertical feed front-end bearing pedestal assembly 23, on vertical feed rear bearing block assembly 27, the housing of vertical feed servomotor 21 is fixed on the housing of vertical feed front-end bearing pedestal assembly 23, its output shaft is connected with vertical feed screw 26 by vertical feed shaft coupling 22, vertical feed nut 24 is supported on vertical feed nut seat 25, the latter is fixed on vertical feed workbench 29 side.During work, vertical feed servomotor 21 drives vertical feed screw 26 to rotate by vertical feed shaft coupling 22, vertical feed screw 26 drives vertical feed nut 24 to move up and down, and drives vertical feed workbench 29 to move up and down eventually through vertical feed nut seat 25.
This horizontal feed moving cell 5 is by horizontal feed motor 51, horizontal feed shaft coupling 52, horizontal feed front-end bearing pedestal assembly 53, horizontal feed nut 54, horizontal feed nut seat 55, horizontal feed leading screw 56, horizontal feed rear bearing block assembly 57, line slideway 58, horizontal feed workbench 59 forms, relation between it is: horizontal feed leading screw 56 is supported in horizontal feed front-end bearing pedestal assembly 53, on horizontal feed rear bearing block assembly 57, the housing of horizontal feed motor 51 is fixed on the housing of horizontal feed front-end bearing pedestal assembly 53, its output shaft is connected with horizontal feed leading screw 56 by horizontal feed shaft coupling 52, horizontal feed nut 54 is supported on horizontal feed nut seat 55, the latter is fixed on horizontal feed workbench 59 side.During work, horizontal feed motor 51 drives horizontal feed leading screw 56 to rotate by horizontal feed shaft coupling 52, and horizontal feed leading screw 56 drives horizontal feed nut 54 side-to-side movement, drives horizontal feed workbench 59 side-to-side movement eventually through horizontal feed nut seat 55.
The vertical feed workbench 29 of 2 of vertical feed moving cell is provided with a unit head oscillating motion unit 7, it forms primarily of a torque motor, also the turntable of worm gear structure or other type can be adopted, its function mainly drives a worm screw tool's power 3 angle G doing oscillating motion or adjust between acquisition worm screw instrument and workpiece, therefore its motion can be a part for ganged movement, also can as adjustment motion.In the occasion of motion that only adjusts, the structure of this unit can adopt artificial or other simple adjustment mode.
This worm screw tool drives unit head 3 is as shown in Fig. 4 a, b, c.Fig. 4 a, 4b, in 4c, worm screw upper tool part 306 is by left, right bearing 319, 320 are supported in by part 305, 307, 315, in the unit head upper body of 317 compositions, worm screw tool lower portion 303 is by left, right bearing 319, the bottom rolling element of 320 is supported in by part 301, 302, 325, in the unit head lower case of 326 compositions, upper and lower two parts determine the relative position relation of its connection status by a pair alignment pin 311, unit head top and the bottom separately housing are linked together by housing attachment screw 328, left, right guide plate 324, 327 are connected on the work top of worm screw instrument folding unit 6 by slide plate screw 323, the movement position and track determined can be had during for controlling the folding of unit head bottom.Worm screw tool servo motor 314 drives the internal gear of worm screw instrument to make it do the controlled rotary motion of continuous print position and speed by cog belt transmission system 313,334,333,332,331 and gear train assembly 330,329,321,322.
This workpiece rotary motion unit 4 is as shown in Fig. 5 a, 5b.In the confined space that housing base 401 and housing cover 402 are formed, a pair driving gear 406 and tray for work pieces gear 408 are installed, wherein driving gear 406 is installed on the end of servomotor 407, tray for work pieces gear 408 is supported on bearing 403, the inside of tray for work pieces gear 408 is just in time identical with the overall diameter of processed gear or identical with the external diameter for workpiece gear being arranged on the fixture in tray for work pieces gear 408, and workpiece to be machined gear 404 can be fixed on tray for work pieces gear 408 with pressing plate and to guarantee the stability of this position.The housing of this unit is connected on the horizontal feed workbench 59 of workpiece level feed motion unit 5, can do horizontal feed motion and the fast forwarding and fast rewinding motion of left and right directions with this workbench.
This worm screw tool's power head folding unit 6 is primarily of the alignment pin 311 in the cylinder 61 shown in Fig. 3 a, Fig. 4 a, Fig. 4 b, Fig. 4 c, worm screw tool drives unit head 3, for fixing and loosen the compositions such as the rolling element hold-down mechanism 335-340 of left and right bearing 319,320 and left and right guide plate 324,327.During installation and removal workpiece, piston 336, cylinder piston 340 is by ball pressing plate 335, 338 push down a left side, right bearing 319, the rolling element of the close opening part of 320, cylinder 61 drives the lower part of worm screw tool drives unit head (housing is together with worm screw tool lower portion 303) to move downward again, now worm screw instrument 303, 306 times top is split up into upper and lower two parts in company with its spring bearing and housing, it is inner that workpiece to be machined gear 404 can enter worm screw tool drives unit head 3 in company with workpiece rotary motion unit 4, this exhaust hood 61 promotes worm screw tool drives unit head bottom on a left side, right guide plate 324, move upward under the constraint of 327, and by alignment pin 311, upper and lower two parts returned and keep correct position relationship, now decontrol piston 336, cylinder piston 340 makes bearing roller be in freely-movable state.Now worm screw tool servo motor 314 can do continuous rotation motion by transmission system drives worm screw instrument 303,306 times tops.Should be noted that, when adopting rolling bearing, worm screw instrument can only have a rotary motion free degree under the constraint of two-sided half-turn raceway, therefore now two halves worm screw instrument might not be linked together by screw pin, but after changing left and right bearing 319,320 into sliding bearing, as gap then needs its two halves to link into an integrated entity too greatly.
During machining gears, first workpiece to be machined gear 404 is arranged in workpiece rotational motion unit 4, recycling worm screw instrument folding unit 6 by worm screw tool drives unit head 3 separately, workpiece is made to enter into worm screw tool interior, close after worm screw instrument folding unit 6, worm screw instrument 303,306 times tops and workpiece to be machined gear 404 form mutually through relation.Unit head oscillating motion unit 7 is utilized to adjust and angle G between control tool and workpiece.Then can utilize four moving cells of workpiece level feed motion unit 5, vertical feed moving cell 2 and worm screw tool drives unit head 3, workpiece rotational motion unit 4 etc. again numerical control program carry out gear teeth processing under controlling.Machine rear recycling worm screw instrument folding unit 6 and open worm screw tool drives unit head 3, the workpiece processed under dismounting, then can enter next working cycles.
(3) advantage and effect: a kind of method and apparatus utilizing cydariform worm screw tool processes internal gear tooth of the present invention, its advantage is: 1) utilize anchor ring cydariform worm screw instrument to realize the Continuous maching of internal gear, greatly can improve working (machining) efficiency; 2) worm screw instrument can be divided into two parts and rear folding in good time before processing, major diameter tool processes minor diameter internal gear surface can be utilized; 3) radius of gyration increasing worm screw instrument can reduce the impact of worm screw rotation error on machining accuracy, and therefore the method may be used for the processing of precise inner gear.
Accompanying drawing explanation
The schematic diagram front view of Fig. 1 a minor diameter worm screw processing major diameter internal gear;
The schematic diagram left view of Fig. 1 b minor diameter worm screw processing major diameter internal gear;
The schematic diagram top view of Fig. 1 c minor diameter worm screw processing major diameter internal gear;
The schematic diagram front view of Fig. 2 a major diameter worm screw processing minor diameter internal gear;
The schematic diagram left view of Fig. 2 b major diameter worm screw processing minor diameter internal gear;
The schematic diagram top view of Fig. 2 c major diameter worm screw processing minor diameter internal gear;
The front view of Fig. 3 a major diameter worm screw tool processes minor diameter inner gearing;
The top view of Fig. 3 b major diameter worm screw tool processes minor diameter inner gearing;
The front view of Fig. 4 a worm screw tool drives unit head;
The left view of Fig. 4 b worm screw tool drives unit head;
The top view of Fig. 4 c worm screw tool drives unit head;
The front view of Fig. 5 a workpiece rotary motion unit;
The top view of Fig. 5 b workpiece rotary motion unit;
The front view of Fig. 6 a opposite opened worm screw instrument separated position;
The front view of Fig. 6 b opposite opened worm screw tool work state;
The left view of Fig. 6 c opposite opened worm screw tool work state;
In figure, symbol description is as follows:
01: processed internal gear; 02: the small-sized worm screw instrument of machining large internal gear; 02 ': the large-scale worm screw instrument processing small-sized internal gear; R0: female radius of a circle of the anchor ring that ring-type worm screw instrument depends on; R1: the pitch radius of processed internal gear; R2: the ring heart radius of circle of the anchor ring that ring-type worm screw instrument depends on and generating circle radius sum; C1: the shape of abscissusing of imaginary gear, namely be the gear of 0 by a kind of thickness obtained after the plane of worm axis and the intersection continuation in worm screw tool work face, this gear around generating circle be R0, ring heart radius of circle anchor ring the obtained a kind of special worm screw for the helical movement that is R2-R0 is exactly the working surface of worm screw instrument proposed by the invention; C2: the figure of imaginary gear after anchor ring ring heart circle tangent line rotates half tooth elongation (single start worm) or multiple half angular pitch identical with number of threads is still imaginary gear; G: the angle of the crossing, namely worm screw instrument ensures and angle of the instrument worm screw determined and processed Gear axis between consistent in meshing point place tangential direction; 02s: the first half of opposite opened worm screw instrument; 02x: the latter half of opposite opened worm screw instrument.0: lathe base; 1: machine pillar; 2: vertical feed moving cell; 3: worm screw tool drives unit head; 4: workpiece rotary motion unit; 5: workpiece level feed motion unit; 6: worm screw instrument folding unit; 61: cylinder 61; 7: unit head oscillating motion unit; 21: vertical feed motor; 22: vertical feed shaft coupling; 23: vertical feed fore bearing assembly; 24: vertical feed nut; 25: vertical feed nut seat; 26: vertical feed screw; 27: vertical feed rear bearing assembly; 28: line slideway; 29: vertical feed workbench; 51: horizontal feed motor; 52: horizontal feed shaft coupling; 53: horizontal feed fore bearing assembly; 54: horizontal feed nut; 55: horizontal feed nut seat; 56: horizontal feed leading screw; 57: horizontal feed rear bearing assembly; 58: line slideway; 59: horizontal feed workbench; 301: lower China and foreign countries housing; 302: inner housing in lower; 303: worm screw tool lower portion; 304:; 305: upper inner housing; 306: worm screw upper tool part; 307: upper shell body; 308: screw; 309: motor adjusting seat; 310: adjustment screw; 311: alignment pin; 312: screw; 313: cog belt drive housing; 314: worm screw tool servo motor; 315: right upper case; 316: in upper shell body; 317: left case; 318:; 319: left bearing; 320: right bearing; 321: key; 322: output shaft; 323: slide plate screw; 324: left guide plate; 325: lower-left housing; 326: bottom right housing; 327: right guide plate; 328: housing attachment screw; 329: output gear; 330: output shaft supporting seat; 331: driven toothed belt wheel; 332: cog belt; 333: initiatively profile of tooth belt wheel; 334: cog belt drive housing cover plate; 335: ball pressing plate; 336: piston; 337: cylinder end piece; 338: ball pressing plate; 339: cylinder end piece; 340: cylinder piston; 401; Housing base; 402: housing cover; 403: bearing; 404: workpiece to be machined gear; 405: work clamp group; 406: driving gear (small―gap suture or clearance elimination gear); 407: servomotor; 408: tray for work pieces gear; A: worm screw tool work surface, the anchor ring helicoid at hobboing cutter cutter tooth cutting edge or emery wheel abrasive material place; B: sealing surface; C: raceway; D: drive the internal gear flank of tooth;
Detailed description of the invention
The present invention includes a kind of method and apparatus utilizing cydariform worm screw tool processes internal gear tooth.
Wherein, comprise a kind of method utilizing cydariform worm screw tool processes internal gear tooth, see Fig. 1 a, 1b, 1c, 2a, 2b, 2c.The method concrete steps are as follows:
Step one: design a kind of pancake or the very short cydariform worm screw instrument of length, as shown in the part 02 in Fig. 1 c or shown in 02 ' in Fig. 2 c.This worm abrasion wheel can be made single head or multistart worm, and worm screw is positioned on an anchor ring, and the generating circle radius of anchor ring is the pitch radius R0 of imaginary gear C1, C2 in Fig. 1 c or Fig. 2 c.In figure, the cross section figure of the gear teeth on C2 is transversal shape rotation half tooth elongation (when worm screw is single start worm) on C1 or the shape after multiple half angular pitch identical with number of threads, its intermediate shape is that this imaginary gear cuts shape simultaneously according to the anchor ring screw formation done after the continuous rotation of above-mentioned rule in the process rotated around tool axis, and the shape of abscissusing of imaginary gear self can be tried to achieve according to envelope principle.
Step 2: design and a kind ofly drive cydariform worm screw instrument continuously according to the worm screw tool drives unit head 3 of given speed and displacement movement.When processing directly very little internal gear and when needing to improve Gear Processing precision, adopt the machine tool structure of large-diameter hollow worm screw tool processes internal gear.Fig. 4 a, 4b, 4c are a kind of front view, left view and top view of utilizing the worm screw tool drives unit head 3 of large scale hollow squeeze worm screw tool processes minor diameter internal gear respectively.Fig. 4 a, 4b, in 4c, worm screw upper tool part 306 is by left, right bearing 319, 320 are supported in by part 305, 307, 315, in the unit head upper body of 317 compositions, worm screw tool lower portion 303 is by left, right bearing 319, the bottom rolling element of 320 is supported in by part 301, 302, 325, in the unit head lower case of 326 compositions, upper and lower two parts determine the relative position relation of its connection status by a pair alignment pin 311, unit head top and the bottom separately housing are linked together by housing attachment screw 328, left, right guide plate 324, 327 are connected on the work top of worm screw instrument folding unit 6 by slide plate screw 323, the movement position and track determined can be had during for controlling the folding of unit head bottom.Worm screw tool servo motor 314 drives the internal gear of worm screw instrument to make it do the controlled rotary motion of continuous print position and speed by cog belt transmission system 313,334,333,332,331 and gear train assembly 330,329,321,322.
Step 3: design a kind of workpiece rotary motion unit 4 driving processed internal gear to do position and speed controlled motion.It is a kind of principle assumption diagram of workpiece rotary motion unit 4 as shown in Fig. 5 a, 5b.In the confined space that housing base 401 and housing cover 402 are formed, a pair driving gear 406 and tray for work pieces gear 408 are installed, wherein driving gear 406 is installed on the end of servomotor 407, tray for work pieces gear 408 is supported on bearing 403, the inside of tray for work pieces gear 408 is just in time identical with the overall diameter of processed gear or identical with the external diameter for workpiece gear being arranged on the fixture in tray for work pieces gear 408, and workpiece to be machined gear 404 can be fixed on tray for work pieces gear 408 with pressing plate and to guarantee the stability of this position.
Step 4: design a kind of interior bracing lathe with 5 frees degree, as shown in Fig. 3 a, 3b.The parts such as a vertical feed moving cell 2, worm screw tool drives unit head 3, workpiece rotary motion unit 4, workpiece level feed motion unit 5, worm screw instrument folding unit 6, unit head oscillating motion unit 7 are comprised with one for the lathe base 0 and the machine pillar 1 that support be connected above each several part in figure.Wherein worm screw tool drives unit head 3 rotates according to the given characteristics of motion for driving worm screw, workpiece rotary motion unit 4 rotates according to the given characteristics of motion for driving workpiece gear, unit head oscillating motion unit 7 is for the angle G between control tool and workpiece, vertical feed moving cell 2 is for the feed motion that makes worm screw instrument rotate to do axis direction when processing internal spur gear while process whole profiles of tooth in facewidth direction, and workpiece level feed motion unit is with realizing radial feed with the machining accuracy of control gear short transverse.Above-mentioned 5 motions suitably can be adjusted by programme-control, and therefore the method may be used for processing internal spur gear, helical teeth internal gear, mending teeth of gear processing etc.Its main points are that worm screw instrument folding unit 6 may be used for controlling the in good time folding of two parts up and down of worm screw tool drives unit head 3, namely when mounting and dismounting workpiece, worm screw instrument keeps separated position, as shown in Figure 6 a, when machining gears, worm screw instrument can keep the closure state shown in Fig. 6 b.
Wherein, also comprise a kind of device utilizing cydariform worm screw tool processes internal gear tooth, as shown in Fig. 3 a, 3b, Fig. 4 a, 4b, 4c, Fig. 5 a, 5b, Fig. 6 a, 6b, 6c.
See Fig. 3 a, 3b, it is the device with the worm screw tool processes minor diameter internal gear of cydariform pitch circle bus of a kind of utilization based on anchor ring, this device forms bed piece by machine pillar 1, lathe base 0, bed piece is connected with vertical feed moving cell 2, worm screw tool drives unit head 3, workpiece rotary motion unit 4, workpiece level feed motion unit 5, worm screw instrument folding unit 6 and unit head oscillating motion unit 7.
This machine pillar 1, lathe base 0 are the box hardwares adopting casting or welding procedure to make;
This vertical feed moving cell 2 is by vertical feed motor 21, vertical feed shaft coupling 22, vertical feed front-end bearing pedestal assembly 23, vertical feed nut 24, vertical feed nut seat 25, vertical feed screw 26, vertical feed rear bearing block assembly 27, line slideway 28, vertical feed workbench 29 forms, relation between it is: vertical feed screw 26 is supported in vertical feed front-end bearing pedestal assembly 23, on vertical feed rear bearing block assembly 27, the housing of vertical feed motor 21 is fixed on the housing of vertical feed front-end bearing pedestal assembly 23, its output shaft is connected with vertical feed screw 26 by vertical feed shaft coupling 22, vertical feed nut 24 is supported on vertical feed nut seat 25, the latter is fixed on vertical feed workbench 29 side.During work, servo vertical feed motor 21 drives vertical feed screw 26 to rotate by vertical feed shaft coupling 22, vertical feed screw 26 drives vertical feed nut 24 to move up and down, and drives vertical feed workbench 29 to move up and down eventually through vertical feed nut seat 25.
This workpiece level feed motion unit 5 is by horizontal feed motor 51, horizontal feed shaft coupling 52, horizontal feed front-end bearing pedestal assembly 53, horizontal feed nut 54, horizontal feed nut seat 55, horizontal feed leading screw 56, horizontal feed rear bearing block assembly 57, line slideway 58, horizontal feed workbench 59 forms, relation between it is: horizontal feed leading screw 56 is supported in horizontal feed front-end bearing pedestal assembly 53, on horizontal feed rear bearing block assembly 57, the housing of horizontal feed motor 51 is fixed on the housing of horizontal feed front-end bearing pedestal assembly 53, its output shaft is connected with horizontal feed leading screw 56 by horizontal feed shaft coupling 52, horizontal feed nut 54 is supported on horizontal feed nut seat 55, the latter is fixed on horizontal feed workbench 59 side.During work, horizontal feed motor 51 drives horizontal feed leading screw 56 to rotate by horizontal feed shaft coupling 52, and horizontal feed leading screw 56 drives horizontal feed nut 54 side-to-side movement, drives horizontal feed workbench 59 side-to-side movement eventually through horizontal feed nut seat 55.
The vertical feed workbench 29 of vertical feed moving cell 2 is provided with a unit head oscillating motion unit 7, it forms primarily of a torque motor, also the turntable of worm gear structure or other type can be adopted, its function mainly drives worm screw tool drives unit head 3 to be oscillating motion or the angle G between adjustment acquisition worm screw instrument and workpiece, therefore its motion can be a part for ganged movement, also can as adjustment motion.In the occasion of motion that only adjusts, the structure of this unit can adopt artificial or other simple adjustment mode.
This worm screw tool drives unit head 3 is as shown in Fig. 4 a, b, c.Fig. 4 a, 4b, in 4c, worm screw upper tool part 306 is by left, right bearing 319, 320 are supported in by part 305, 307, 315, in the unit head upper body of 317 compositions, worm screw tool lower portion 303 is by left, right bearing 319, the bottom rolling element of 320 is supported in by part 301, 302, 325, in the unit head lower case of 326 compositions, upper and lower two parts determine the relative position relation of its connection status by a pair alignment pin 311, unit head top and the bottom separately housing are linked together by housing attachment screw 328, left, right guide plate 324, 327 are connected on the work top of worm screw instrument folding unit 6 by slide plate screw 323, the movement position and track determined can be had during for controlling the folding of unit head bottom.Worm screw tool servo motor 314 drives the internal gear of worm screw instrument to make it do the controlled rotary motion of continuous print position and speed by cog belt transmission system 313,334,333,332,331 and gear train assembly 330,329,321,322.
This workpiece rotary motion unit 4 is as shown in Fig. 5 a, 5b.In the confined space that housing base 401 and housing cover 402 are formed, a pair driving gear 406 and tray for work pieces gear 408 are installed, wherein driving gear 406 is installed on the end of servomotor 407, tray for work pieces gear 408 is supported on bearing 403, the inside of tray for work pieces gear 408 is just in time identical with the overall diameter of processed gear or identical with the external diameter for workpiece gear being arranged on the fixture in tray for work pieces gear 408, and workpiece to be machined gear 404 can be fixed on tray for work pieces gear 408 by work clamp group 405 and to guarantee the stability of this position.The housing of this unit is connected on the horizontal feed workbench 59 of workpiece level feed motion unit 5, can do horizontal feed motion and the fast forwarding and fast rewinding motion of left and right directions with this workbench.
This worm screw instrument folding unit 6 is primarily of the alignment pin 311 in the cylinder 61 shown in Fig. 3 a, Fig. 4 a, Fig. 4 b, Fig. 4 c, worm screw tool drives unit head 3, for fixing and loosen the compositions such as the rolling element hold-down mechanism 335-340 of left and right bearing 319,320 and left and right guide plate 324,327.During installation and removal workpiece, piston 336, cylinder piston 340 is by ball pressing plate 335, 338 push down a left side, right bearing 319, the rolling element of the close opening part of 320, cylinder 61 drives the lower part of worm screw tool drives unit head 3 (housing is together with worm screw tool lower portion 303) to move downward again, now worm screw instrument 306, 303 top and the bottom are split up into upper and lower two parts in company with its spring bearing and housing, it is inner that workpiece to be machined gear 404 can enter worm screw tool drives unit head 3 in company with workpiece rotary motion unit 4, this exhaust hood 61 promotes worm screw tool drives unit head 3 bottom on a left side, right guide plate 324, move upward under the constraint of 327, and by alignment pin 311, upper and lower two parts returned and keep correct position relationship, now decontrol piston 336, cylinder piston 340 makes bearing roller be in freely-movable state.Now worm screw tool servo motor 314 can do continuous rotation motion by transmission system drives worm screw instrument 306,303 top and the bottom.
During machining gears, first workpiece to be machined gear 404 is arranged in workpiece rotary motion unit 4, recycling worm screw instrument folding unit 6 by worm screw tool drives unit head 3 separately, workpiece is made to enter into worm screw tool interior, close after worm screw instrument folding unit 6, worm screw instrument 306,303 top and the bottom and workpiece to be machined gear 404 form mutually through relation.Unit head oscillating motion unit 7 is utilized to adjust and angle G between control tool and workpiece.Then can utilize four moving cells of workpiece level feed motion unit 5, vertical feed moving cell 2 and worm screw tool drives unit head 3, workpiece rotational motion unit 4 etc. again numerical control program carry out gear teeth processing under controlling.Machine rear recycling worm screw instrument folding unit 6 and open worm screw tool drives unit head 3, the workpiece processed under dismounting, then can enter next working cycles.
Claims (2)
1. utilize a method for cydariform worm screw tool processes internal gear tooth, it is characterized in that: the method concrete steps are as follows:
Step one: design a kind of pancake or the very short cydariform worm screw instrument of length; This worm screw instrument is made into single head or multistart worm, and worm screw is positioned on an anchor ring, and the generating circle radius of anchor ring is the pitch radius R0 of imaginary gear 1 (C1), imaginary gear 2 (C2); The cross section figure of the gear teeth on imaginary gear 2 (C2) is the cross section figure rotation half tooth elongation on imaginary gear 1 (C1) or the shape after multiple half angular pitch identical with number of threads, its intermediate shape is that this imaginary gear 1 (C1) and imaginary gear 2 (C2) cross section figure are formed according to the anchor ring screw done after the continuous rotation of above-mentioned rule in the process rotated around tool axis simultaneously, and the cross section figure of imaginary gear 1 (C1) and imaginary gear 2 (C2) self is tried to achieve according to envelope principle;
Step 2: design and a kind ofly drive cydariform worm screw instrument continuously according to the worm screw tool drives unit head of given speed and displacement movement; When processing major diameter internal gear, worm screw is made into flat structure and is placed in the inside of processed gear, and the motion of worm screw adopts conventional angle milling or drill unit support and carry out transmission by precision gear chain; Now cydariform worm screw instrument stands on the support of its both ends of the surface by its endoporus and end face and two groups of bearings, one end of cydariform worm screw instrument is parallel with an external gear, this external gear by the gears meshing on output shaft in the very little group of meshed gears successively of the diameter of a string axis being parallel and the enough servomotors at a distance of pedestal upper end, thus realizes the Direct driver of servomotor to cydariform worm screw instrument;
When processing minor diameter internal gear, cydariform worm screw upper tool part (306) is by left bearing (319), right bearing (320) is supported in by upper inner housing (305), upper shell body (307), right upper case (315), in the unit head upper body that left case (317) forms, cydariform worm screw tool lower portion (303) is by left bearing (319), the bottom rolling element of right bearing (320) is supported in by lower China and foreign countries housing (301), inner housing (302) in lower, lower-left housing (325), in the unit head lower case that bottom right housing (326) forms, the upper and lower two parts of cydariform worm screw instrument determine the relative position relation of its connection status by a pair alignment pin (311), unit head top and the bottom separately housing are linked together by housing attachment screw (328), left guide plate (324), right guide plate (327) is connected on the work top of worm screw instrument folding unit (6) by slide plate screw (323), the movement position and track determined can be had during for controlling the folding of unit head bottom, worm screw tool servo motor (314) drives cydariform worm screw instrument to make it do continuous print position and the controlled rotary motion of speed by cog belt transmission system and gear train assembly,
Wherein, cog belt transmission system comprises cog belt drive housing (313), cog belt drive housing cover plate (334), initiatively profile of tooth belt wheel (333), cog belt (332) and driven toothed belt wheel (331);
Gear train assembly comprises output shaft supporting seat (330), output gear (329), key (321) and output shaft (322);
Step 3: design a kind of workpiece rotary motion unit (4) driving workpiece to be machined gear to do position and speed controlled motion, in the confined space that its housing base (401) and housing cover (402) are formed, driving gear (406) and tray for work pieces gear (408) are installed, wherein driving gear (406) is installed on the end of servomotor (407), tray for work pieces gear (408) is supported on bearing (403), the internal diameter of tray for work pieces gear (408) is just in time identical with the overall diameter of workpiece to be machined gear or identical with the external diameter for workpiece to be machined gear being arranged on the fixture in tray for work pieces gear (408), workpiece to be machined gear (404) to be fixed on tray for work pieces gear (408) by work clamp group (405) and to guarantee the stability of this position,
Step 4: design a kind of interior bracing lathe with 5 frees degree, it comprises a vertical feed moving cell (2), worm screw tool drives unit head (3), workpiece rotary motion unit (4), workpiece level feed motion unit (5), worm screw instrument folding unit (6), unit head oscillating motion unit (7) with one for the lathe base supported be connected above each several part (0) and machine pillar (1), wherein worm screw tool drives unit head (3) rotates according to the given characteristics of motion for driving worm screw, workpiece rotary motion unit (4) rotates according to the given characteristics of motion for driving workpiece gear, unit head oscillating motion unit (7) is for the angle G between control tool and workpiece, vertical feed moving cell (2) for the feed motion that makes worm screw instrument rotate to do axis direction when processing internal spur gear while process whole profiles of tooth in facewidth direction, workpiece level feed motion unit (5) is with realizing radial feed with the machining accuracy of control gear short transverse, above-mentioned 5 move through programme-control and suitably adjust, therefore the method is for processing the processing of internal spur gear, helical teeth internal gear or mending teeth of gear, its main points are that worm screw instrument folding unit (6) is for controlling the in good time folding of two parts up and down of worm screw tool drives unit head (3), namely when mounting and dismounting workpiece, worm screw instrument keeps separated position, and when machining gears, worm screw instrument is kept closed.
2. one kind utilizes the device of cydariform worm screw tool processes internal gear tooth, it is characterized in that: this device forms bed piece by machine pillar (1), lathe base (0), bed piece is connected with vertical feed moving cell (2), worm screw tool drives unit head (3), workpiece rotary motion unit (4), workpiece level feed motion unit (5), worm screw instrument folding unit (6) and unit head oscillating motion unit (7);
This machine pillar (1), lathe base (0) are the box hardwares adopting casting or welding procedure to make;
This vertical feed moving cell (2) is made up of vertical feed servomotor (21), vertical feed shaft coupling (22), vertical feed front-end bearing pedestal assembly (23), vertical feed nut (24), vertical feed nut seat (25), vertical feed screw (26), vertical feed rear bearing block assembly (27), line slideway (28), vertical feed workbench (29); Vertical feed screw (26) is supported on vertical feed front-end bearing pedestal assembly (23), vertical feed rear bearing block assembly (27), the housing of vertical feed servomotor (21) is fixed on the housing of vertical feed front-end bearing pedestal assembly (23), its output shaft is connected with vertical feed screw (26) by vertical feed shaft coupling (22), vertical feed nut (24) is supported on vertical feed nut seat (25), and vertical feed nut seat (25) is fixed on vertical feed workbench (29) side; During work, vertical feed servomotor (21) drives vertical feed screw (26) to rotate by vertical feed shaft coupling (22), vertical feed screw (26) drives vertical feed nut (24) to move up and down, and drives vertical feed workbench (29) to move up and down eventually through vertical feed nut seat (25);
This workpiece level feed motion unit (5) is made up of horizontal feed motor (51), horizontal feed shaft coupling (52), horizontal feed front-end bearing pedestal assembly (53), horizontal feed nut (54), horizontal feed nut seat (55), horizontal feed leading screw (56), horizontal feed rear bearing block assembly (57), line slideway (58), horizontal feed workbench (59); Horizontal feed leading screw (56) is supported on horizontal feed front-end bearing pedestal assembly (53), horizontal feed rear bearing block assembly (57), the housing of horizontal feed motor (51) is fixed on the housing of horizontal feed front-end bearing pedestal assembly (53), its output shaft is connected with horizontal feed leading screw (56) by horizontal feed shaft coupling (52), horizontal feed nut (54) is supported on horizontal feed nut seat (55), and horizontal feed nut seat (55) is fixed on horizontal feed workbench (59) side; During work, horizontal feed motor (51) drives horizontal feed leading screw (56) to rotate by horizontal feed shaft coupling (52), horizontal feed leading screw (56) drives horizontal feed nut (54) side-to-side movement, drives horizontal feed workbench (59) side-to-side movement eventually through horizontal feed nut seat (55);
The vertical feed workbench (29) of vertical feed moving cell (2) is provided with a unit head oscillating motion unit (7), it forms primarily of a torque motor, also worm gear structure can be adopted, unit head oscillating motion unit (7) function drives worm screw tool drives unit head (3) to be oscillating motion or the angle G between adjustment acquisition worm screw instrument and workpiece, therefore worm screw tool drives unit head (3) motion is a part for ganged movement, in the occasion of motion that only adjusts, the structure of this unit adopts and manually adjusts mode;
This worm screw tool drives unit head (3), its worm screw upper tool part (306) is by left bearing (319), right bearing (320) is supported in by upper inner housing (305), upper shell body (307), right upper case (315), in the unit head upper body that left case (317) forms, worm screw tool lower portion (303) is by left bearing (319), the bottom rolling element of right bearing (320) is supported in by lower China and foreign countries housing (301), inner housing (302) in lower, lower-left housing (325), in the unit head lower case that bottom right housing (326) forms, the upper and lower two parts of worm screw instrument determine the relative position relation of its connection status by a pair alignment pin (311), unit head top and the bottom separately housing are linked together by housing attachment screw (328), left guide plate (324), right guide plate (327) is connected on the work top of worm screw instrument folding unit (6) by slide plate screw (323), the movement position and track determined can be had during for controlling the folding of unit head bottom, worm screw tool servo motor (314) drives worm screw instrument to make it do continuous print position and the controlled rotary motion of speed by cog belt transmission system and gear train assembly,
Wherein, cog belt transmission system comprises cog belt drive housing (313), cog belt drive housing cover plate (334), initiatively profile of tooth belt wheel (333), cog belt (332) and driven toothed belt wheel (331);
Gear train assembly comprises output shaft supporting seat (330), output gear (329), key (321) and output shaft (322);
This workpiece rotary motion unit (4), in the confined space that its housing base (401) and housing cover (402) are formed, driving gear (406) and tray for work pieces gear (408) are installed, wherein driving gear (406) is installed on the end of servomotor (407), tray for work pieces gear (408) is supported on bearing (403), the inside of tray for work pieces gear (408) is just in time identical with the overall diameter of processed gear or identical with the external diameter for workpiece gear being arranged on the fixture in tray for work pieces gear (408), workpiece to be machined gear (404) to be fixed on tray for work pieces gear (408) with pressing plate and to guarantee the stability of this position, the housing of this unit is connected on the horizontal feed workbench (59) of workpiece level feed motion unit (5), does horizontal feed motion and the fast forwarding and fast rewinding motion of left and right directions with this workbench,
This worm screw instrument folding unit (6), by the alignment pin (311) in cylinder (61), worm screw tool drives unit head (3), for fixing and loosen left bearing (319), the rolling element hold-down mechanism of right bearing (320) and left guide plate (324), right guide plate (327) forms, during installation and removal workpiece, piston (336), cylinder piston (340) pushes down left bearing (319) by ball pressing plate, the rolling element of the close opening part of right bearing (320), cylinder (61) drives the lower part of worm screw tool drives unit head to move downward again, now worm screw tool lower portion (303), worm screw upper tool part (306) is split up into upper and lower two parts in company with its spring bearing and housing, it is inner that workpiece to be machined gear (404) enters worm screw tool drives unit head (3) in company with workpiece rotary motion unit (4), this exhaust hood (61) promotes worm screw tool drives unit head bottom in left guide plate (324), move upward under the constraint of right guide plate (327), and upper and lower two parts are returned by alignment pin (311) and keeps correct position relationship, now decontrol piston (336), cylinder piston (340) makes bearing roller be in freely-movable state, now worm screw tool servo motor (314) does continuous rotation motion by transmission system drives worm screw tool lower portion (303), worm screw upper tool part (306), when adopting rolling bearing, cydariform worm screw instrument can only have a rotary motion free degree under the constraint of two-sided half-turn raceway, therefore now two halves cydariform worm screw instrument does not need to be linked together by screw or pin, but after changing left bearing (319), right bearing (320) into sliding bearing, as gap then needs its two halves to link into an integrated entity too greatly,
Wherein, rolling element hold-down mechanism comprises ball pressing plate (335), piston (336), cylinder end piece (337), ball pressing plate (338), cylinder end piece (339) and cylinder piston (340).
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| CN108637402B (en) * | 2018-04-20 | 2019-11-15 | 盐城市金洲机械制造有限公司 | A kind of high-strength gear processing unit (plant) and processing method |
| CN113486476B (en) * | 2021-08-11 | 2023-04-18 | 重庆大学 | Grinding wheel tooth profile design method for grinding double-arc harmonic reducer rigid wheel slotting tool |
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